Bi-templated grain growth maximizing the effects of texture on piezoelectricity |
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Authors: | Woo-Seok Kang Tae-Gon Lee Joo-Hee Kang Ju-Hyeon Lee Gangho Choi Sun-Woo Kim Sahn Nahm Wook Jo |
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Affiliation: | 1. School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Ulsan 44919, Republic of Korea;2. Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea;3. Materials Analysis & Evaluation Department, Korea Institute of Materials Science (KIMS), 797, Changwondaero, Seongsan, Changwon, Gyeongnam, 51508, Republic of Korea |
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Abstract: | Templated grain growth is beneficial for piezoelectric materials, the properties of which become the best in their single crystalline form. Nevertheless, a textured ceramic prepared by a templated grain growth technique often fails in exhibiting as good properties as expected in single crystals even with a high degree of orientation factor. Here, we propose a new strategy for maximizing texturing effect by suppressing the growth of untextured matrix grains. The textured ceramics made by our method, so-called bi-templated grain growth, are featured by ultrahigh piezoelectric properties (d33 = ~1,031 pC/N, d?g = ~59,000, kp = ~0.76). A special emphasis is on the achieved electric-field-induced strain of 0.13 % at 1 kV/mm, which is as high as that of single crystals. This work demonstrates that not only the degree of texture but also the coarsening of untextured matrix grains should be well-controlled to best exploit the templated grain growth technique. |
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Keywords: | Templated grain growth Piezoceramics Electromechanical strains |
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